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[Benjamin Zeller <1485682@xxxxxxxxxxxxxxxxxx>]

I can confirm this Bug, I use a Dell USB 3.0 docking station for my XPS15. 
The Laptop screen flickers, but not the one attached to the docking station (2 Monitor setup).

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https://bugs.launchpad.net/bugs/1485682

Title:
  Mouse pointer flickers at using DisplayLink

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Using the new official DisplayLink driver for Ubuntu from
  http://www.displaylink.com/downloads/ubuntu.php for my USB-
  DisplayLink-Adapter causes on the two main monitors (DisplayPort and
  internal monitor) a flickering mouse. The pointer doesn't flicker on
  third monitor (DisplayLink monitor).

  This also seems to be related to this bug:
  https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1278223

  Using:

  * Ubuntu 14.04.3 (Kernel 3.16)
  * DisplayLink Ubuntu driver 1.0.68
  * XOrg  1:7.7+1ubuntu8.1

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.16.0-45.60~14.04.1-generic 3.16.7-ckt14
  Uname: Linux 3.16.0-45-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,regex,imgpng,scale,vpswitch,grid,move,mousepoll,snap,gnomecompat,resize,place,workarounds,unitymtgrabhandles,session,expo,wall,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Mon Aug 17 18:31:55 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:058b]
  InstallationDate: Installed on 2014-05-30 (444 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. XPS L322X
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-45-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/28/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0PJHXN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd08/28/2013:svnDellInc.:pnXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS L322X
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Mon Aug 17 18:16:57 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               22136 
   vendor                                     GSM
  xserver.version: 2:1.15.1-0ubuntu2.7

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